EXHIBIT 21.1

Subsidiaries of NYSE Group, Inc.



|                                              |  |  |  |                               
|--------------------------------------------- |  |  |  | ------------------------------
|Name                                          |  |  |  | State or Jurisdictionof Entity
|New York Stock Exchange LLC(1)                |  |  |  | New York                      
|NYSE Market, Inc.(2)                          |  |  |  | Delaware                      
|NYSE Regulation, Inc.(2)                      |  |  |  | New York                      
|Stock Clearing Corporation(2)                 |  |  |  | New York                      
|Newex Corporation(2)                          |  |  |  | New York                      
|Newin Corporation(2)                          |  |  |  | New York                      
|New York Stock Exchange, Inc.(2)              |  |  |  | Connecticut                   
|New York Stock Exchange(2)                    |  |  |  | New Jersey                    
|NYSE Market LLC(3)                            |  |  |  | Delaware                      
|Securities Industry Automation Corporation(2) |  |  |  | New York                      
|Sector, Inc.(4)                               |  |  |  | New York                      
|Archipelago Holdings, Inc.(1)                 |  |  |  | Delaware                      
|ARCAGNC Acquisition, L.L.C.(5)               |  |  |  | Delaware                      
|Archipelago Trading Services, Inc.(6)         |  |  |  | Florida                       
|Archipelago Direct, L.L.C.(5)                 |  |  |  | Delaware                      
|Archipelago Europe, Ltd(5)                    |  |  |  | England & Wales               
|NYSE Arca, L.L.C.(5)                          |  |  |  | Delaware                      
|Archipelago Market Data Services, L.L.C.(5)   |  |  |  | Delaware                      
|Archipelago Securities, L.L.C.(5)             |  |  |  | Delaware                      
|NYSE Arca Holdings, Inc.(5)                   |  |  |  | Delaware                      
|NYSE Arca, Inc.(7)                            |  |  |  | Delaware                      
|NYSE Arca Equities, Inc.(8)                   |  |  |  | Delaware                      
|Pacific Clearing Corporation(7)               |  |  |  | California                    
|Pacific Board of Trade(7)                     |  |  |  | California                    
|NYSE Euronext, Inc.(1)                        |  |  |  | Delaware                      
|Jefferson Merger Sub, Inc.(9)                 |  |  |  | Delaware                      
|NYSE Euronext (International) B.V.(9)         |  |  |  | The Netherlands               
|NYSE Euronext (Holding) N.V.(10)              |  |  |  | The Netherlands               
|TransactTools, Inc.(1)                        |  |  |  | Delaware                      
|NASD/NYSE Trade Reporting Facility LLC(3)     |  |  |  | Delaware                      

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|(1) | Wholly owned subsidiary of NYSE Group, Inc.
|--- | -------------------------------------------

|(2) | Wholly owned subsidiary of New York Stock Exchange LLC
|--- | ------------------------------------------------------

|(3) | Wholly owned subsidiary of NYSE Market, Inc.
|--- | --------------------------------------------

|(4) | Wholly owned subsidiary of Securities Industry Automation Corporation
|--- | ---------------------------------------------------------------------

|(5) | Wholly owned subsidiary of Archipelago Holdings, Inc.
|--- | -----------------------------------------------------

|(6) | Wholly owned subsidiary of ARCAGNC Acquisition, L.L.C.
|--- | -------------------------------------------------------

|(7) | Wholly owned subsidiary of NYSE Arca Holdings, Inc.
|--- | ---------------------------------------------------

|(8) | Wholly owned subsidiary of NYSE Arca, Inc.
|--- | ------------------------------------------

|(9) | Wholly owned subsidiary of NYSE Euronext, Inc.
|--- | ----------------------------------------------

|(10) | Wholly owned subsidiary of NYSE Euronext (International) B.V.
|---- | -------------------------------------------------------------